I think you are asking good questions here, and I applaud you for wanting to know more. What I am going to do is encourage you to do some digging on your own. Think through the processes that occur. Think about some common sense here, if you were wearing a vest with electrical capabilities, would you go swimming with it? I highly doubt it. While I have been out of EMS for a few years now, I have never come across one of these devices, but I believe the technology is there. Talk to ER docs when you are on clinical rotations, do a google search and try and learn more.
On the note of grammar and spelling. I didn't want to say anything because I am lazy and don't typically pick out issues but I have seen numerous posts by you that are very difficult to comprehend because of your grammar and spelling. Part of EMS is documentation, legal documentation. Every patient record can be called up in a court case, where educated lawyers, judges, and court officials will be reading them. If you can not spell scene correctly, as I noted you spelled it seen in your original post, then these people are going to have a difficult time understanding you.
I understand 100% learning disabilities and physical disabilities. Typing this post out, my thumb has dislocated twice due to my genetic condition, Ehlers-Danlos Syndrome. That has not affected my ability to hit delete a few times and re-type out the words that I slipped up on. Learning disabilities, I had the 504 plans the IEP's, all the alphabet soup testing, and it came out I had learning disabilities, slower than average comprehension, and difficulty with short-term memory.
I believe you are getting very defensive as a coping mechanism for your struggles. Pretty common in my experience, but not necessary. When someone comments on your spelling, I suggest you learn from it, and in the future you attempt to not make the same mistakes again. People here want nothing more than to see you succeed in EMS and sometimes that comes off the wrong way. Try to brush it off, and learn from the people here.
Again, I applaud you for taking the initiative in your own learning process and asking these questions. Just understand where we are coming from when we see incomprehensible grammar. It will get you in trouble in the future with your documentation.
Best of luck to you,
Kate